The international boundary runs through East Grand Lake and the Chiputneticook lakes, with the deepest parts of the lakes defining the border between the U.S. and Canada. Glaciers carved these lakes during the Ice Age 25,000 years ago, and as the Laurentide Ice Sheet retreated it left glacial till, gravel, sand, and rounded dropstone boulders along the shores of North, East Grand, Mud, Spednic, Palfrey, Brackett, and Deering Lakes. Long winding glacial eskers, or horsebacks, formed from sand and gravel deposited by rivers flowing in, on, or under a glacier, and their paths follow the glacier's direction. The area was once farm country, but with the exception of the Brackett farm only traces remain of the many farms that once lined the road. Old fields, rock-lined shores, rail fencing, farm wagons, and surviving apple trees point to a past landscape of crops, dairy cows, and sheep, while antique apple varieties and local traditions such as trout with wild fiddleheads reflect the area's continuing rural character.